Commit | Line | Data |
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501c9c08 NF |
1 | /* |
2 | * Driver for EHCI UHP on Atmel chips | |
3 | * | |
4 | * Copyright (C) 2009 Atmel Corporation, | |
5 | * Nicolas Ferre <nicolas.ferre@atmel.com> | |
6 | * | |
7 | * Based on various ehci-*.c drivers | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file COPYING in the main directory of this archive for | |
11 | * more details. | |
12 | */ | |
13 | ||
14 | #include <linux/clk.h> | |
15 | #include <linux/platform_device.h> | |
9475375a | 16 | #include <linux/of.h> |
9d843003 | 17 | #include <linux/of_platform.h> |
501c9c08 NF |
18 | |
19 | /* interface and function clocks */ | |
20 | static struct clk *iclk, *fclk; | |
21 | static int clocked; | |
22 | ||
23 | /*-------------------------------------------------------------------------*/ | |
24 | ||
25 | static void atmel_start_clock(void) | |
26 | { | |
27 | clk_enable(iclk); | |
28 | clk_enable(fclk); | |
29 | clocked = 1; | |
30 | } | |
31 | ||
32 | static void atmel_stop_clock(void) | |
33 | { | |
34 | clk_disable(fclk); | |
35 | clk_disable(iclk); | |
36 | clocked = 0; | |
37 | } | |
38 | ||
39 | static void atmel_start_ehci(struct platform_device *pdev) | |
40 | { | |
41 | dev_dbg(&pdev->dev, "start\n"); | |
42 | atmel_start_clock(); | |
43 | } | |
44 | ||
45 | static void atmel_stop_ehci(struct platform_device *pdev) | |
46 | { | |
47 | dev_dbg(&pdev->dev, "stop\n"); | |
48 | atmel_stop_clock(); | |
49 | } | |
50 | ||
51 | /*-------------------------------------------------------------------------*/ | |
52 | ||
53 | static int ehci_atmel_setup(struct usb_hcd *hcd) | |
54 | { | |
55 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
1a49e2ac | 56 | int retval; |
501c9c08 NF |
57 | |
58 | /* registers start at offset 0x0 */ | |
59 | ehci->caps = hcd->regs; | |
501c9c08 | 60 | |
1a49e2ac | 61 | retval = ehci_setup(hcd); |
501c9c08 NF |
62 | if (retval) |
63 | return retval; | |
64 | ||
501c9c08 NF |
65 | ehci_port_power(ehci, 0); |
66 | ||
67 | return retval; | |
68 | } | |
69 | ||
70 | static const struct hc_driver ehci_atmel_hc_driver = { | |
71 | .description = hcd_name, | |
72 | .product_desc = "Atmel EHCI UHP HS", | |
73 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
74 | ||
75 | /* generic hardware linkage */ | |
76 | .irq = ehci_irq, | |
77 | .flags = HCD_MEMORY | HCD_USB2, | |
78 | ||
79 | /* basic lifecycle operations */ | |
80 | .reset = ehci_atmel_setup, | |
81 | .start = ehci_run, | |
82 | .stop = ehci_stop, | |
83 | .shutdown = ehci_shutdown, | |
84 | ||
85 | /* managing i/o requests and associated device resources */ | |
86 | .urb_enqueue = ehci_urb_enqueue, | |
87 | .urb_dequeue = ehci_urb_dequeue, | |
88 | .endpoint_disable = ehci_endpoint_disable, | |
b48d7f50 | 89 | .endpoint_reset = ehci_endpoint_reset, |
501c9c08 NF |
90 | |
91 | /* scheduling support */ | |
92 | .get_frame_number = ehci_get_frame, | |
93 | ||
94 | /* root hub support */ | |
95 | .hub_status_data = ehci_hub_status_data, | |
96 | .hub_control = ehci_hub_control, | |
97 | .bus_suspend = ehci_bus_suspend, | |
98 | .bus_resume = ehci_bus_resume, | |
99 | .relinquish_port = ehci_relinquish_port, | |
100 | .port_handed_over = ehci_port_handed_over, | |
b48d7f50 PM |
101 | |
102 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
501c9c08 NF |
103 | }; |
104 | ||
9d843003 JCPV |
105 | static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32); |
106 | ||
0dfeefbc | 107 | static int __devinit ehci_atmel_drv_probe(struct platform_device *pdev) |
501c9c08 NF |
108 | { |
109 | struct usb_hcd *hcd; | |
110 | const struct hc_driver *driver = &ehci_atmel_hc_driver; | |
111 | struct resource *res; | |
112 | int irq; | |
113 | int retval; | |
114 | ||
115 | if (usb_disabled()) | |
116 | return -ENODEV; | |
117 | ||
118 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); | |
119 | ||
120 | irq = platform_get_irq(pdev, 0); | |
121 | if (irq <= 0) { | |
122 | dev_err(&pdev->dev, | |
123 | "Found HC with no IRQ. Check %s setup!\n", | |
124 | dev_name(&pdev->dev)); | |
125 | retval = -ENODEV; | |
126 | goto fail_create_hcd; | |
127 | } | |
128 | ||
9d843003 JCPV |
129 | /* Right now device-tree probed devices don't get dma_mask set. |
130 | * Since shared usb code relies on it, set it here for now. | |
131 | * Once we have dma capability bindings this can go away. | |
132 | */ | |
133 | if (!pdev->dev.dma_mask) | |
134 | pdev->dev.dma_mask = &at91_ehci_dma_mask; | |
135 | ||
501c9c08 NF |
136 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
137 | if (!hcd) { | |
138 | retval = -ENOMEM; | |
139 | goto fail_create_hcd; | |
140 | } | |
141 | ||
142 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
143 | if (!res) { | |
144 | dev_err(&pdev->dev, | |
145 | "Found HC with no register addr. Check %s setup!\n", | |
146 | dev_name(&pdev->dev)); | |
147 | retval = -ENODEV; | |
148 | goto fail_request_resource; | |
149 | } | |
150 | hcd->rsrc_start = res->start; | |
f65c3540 | 151 | hcd->rsrc_len = resource_size(res); |
501c9c08 | 152 | |
97983431 | 153 | hcd->regs = devm_request_and_ioremap(&pdev->dev, res); |
501c9c08 NF |
154 | if (hcd->regs == NULL) { |
155 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
156 | retval = -EFAULT; | |
97983431 | 157 | goto fail_request_resource; |
501c9c08 NF |
158 | } |
159 | ||
97983431 | 160 | iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
501c9c08 NF |
161 | if (IS_ERR(iclk)) { |
162 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
163 | retval = -ENOENT; | |
97983431 | 164 | goto fail_request_resource; |
501c9c08 | 165 | } |
97983431 | 166 | fclk = devm_clk_get(&pdev->dev, "uhpck"); |
501c9c08 NF |
167 | if (IS_ERR(fclk)) { |
168 | dev_err(&pdev->dev, "Error getting function clock\n"); | |
169 | retval = -ENOENT; | |
97983431 | 170 | goto fail_request_resource; |
501c9c08 NF |
171 | } |
172 | ||
173 | atmel_start_ehci(pdev); | |
174 | ||
175 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
176 | if (retval) | |
177 | goto fail_add_hcd; | |
178 | ||
179 | return retval; | |
180 | ||
181 | fail_add_hcd: | |
182 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
183 | fail_request_resource: |
184 | usb_put_hcd(hcd); | |
185 | fail_create_hcd: | |
186 | dev_err(&pdev->dev, "init %s fail, %d\n", | |
187 | dev_name(&pdev->dev), retval); | |
188 | ||
189 | return retval; | |
190 | } | |
191 | ||
0dfeefbc | 192 | static int __devexit ehci_atmel_drv_remove(struct platform_device *pdev) |
501c9c08 NF |
193 | { |
194 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
195 | ||
196 | ehci_shutdown(hcd); | |
197 | usb_remove_hcd(hcd); | |
501c9c08 NF |
198 | usb_put_hcd(hcd); |
199 | ||
200 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
201 | fclk = iclk = NULL; |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
9d843003 JCPV |
206 | #ifdef CONFIG_OF |
207 | static const struct of_device_id atmel_ehci_dt_ids[] = { | |
208 | { .compatible = "atmel,at91sam9g45-ehci" }, | |
209 | { /* sentinel */ } | |
210 | }; | |
211 | ||
212 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); | |
213 | #endif | |
214 | ||
501c9c08 NF |
215 | static struct platform_driver ehci_atmel_driver = { |
216 | .probe = ehci_atmel_drv_probe, | |
0dfeefbc | 217 | .remove = __devexit_p(ehci_atmel_drv_remove), |
501c9c08 | 218 | .shutdown = usb_hcd_platform_shutdown, |
9d843003 JCPV |
219 | .driver = { |
220 | .name = "atmel-ehci", | |
221 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), | |
222 | }, | |
501c9c08 | 223 | }; |